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, it will give what? give the energy to ping-pong ball and it itself will slow down. and so what do you do is you take these things and you bounce them off atoms like the size of carbon. did you ever hear about the heavy water? you bounce them off light atoms or molecules and these things will slow down, so they're moderated and will cause the reaction of more of this fission. you call--nuclear fission, gang, breaking apart, nuclear fission, and you will fission more atoms. anyway, this is something that cause an awful lot of excitement. because along with these two, it turns out the kinetic energy of these particles and these, all flying apart, is awesome. the energy that takes to light up new york city comes about as a result of water pouring over niagara falls. and every water drop has an energy of about this much, four electron volts. electron volts are tiny unit of energy. it's microscopic unit of energy, yeah? but four electron volts per water drop, tnt-- [makes sounds] --you get about 30 electron volts. high-octane gasoline, about 30 electron volts per molecule of combustion, yeah? one ato
if this book were hotter? what would it do to the table? energy would cascade from the book to the table until they both became the same temperature and they will level off. so that alcohol that's poured on your back has the same temperature as anything else around, but it feels cold. and why does it feel cold, gang? because what is that alcohol doing? what it's doing is what we're gonna be talking about today. it's changing state. it's changing from the liquid state to the gaseous state, okay? and we call that what? begin with ev? evaporation. evaporation, that's right. and we're gonna be learning that evaporation is a cooling process. you know, sometimes you're swimming and you come out and you're all wet, a little breeze come by and you feel kinda chilly. but if no breeze comes by, you don't feel so chilly. and what's going on? when that breeze comes by, what happens to the water on your body? evaporates. it evaporates. when it evaporates, how does your body feel? begin with a c. - cool. - cool. now, we're gonna ask the question hc. why is it that evaporation is a cooling process? and we ca
that's one degree celsius. if something is one degree above freezing, would it be radiating energy? yes. would that energy have a frequency? how about i compare that to radiating at two degrees above celsius? would that be radiating energy? would that energy have a frequency? yes. would that frequency be doubled? no. check your neighbor. yeah. ah. hey, gang. would the temperature be-- would the frequency be doubled? get right to that point. get right to that question. the question is: wouldn't that work best for kelvin? yeah. honey, it will only work for kelvin because one degree celsius is not twice as hot as two is-- i should say two degrees celsius is not twice as hot as one degree celsius. see, to say twice as hot is to imply twice the internal energy. try this one. the waitress brings over some coffee because you've ordered coffee with your apple pie, and you say, "oh, i'd like the coffee really hot." and she brings it over, and you put your trusty thermometer in, and, son of a gun, it's iced coffee. ice cubes and everything. it's zero degrees celsius. and you say to the waitress,
international. samantha smith is also with us, leader of the world wildlife fund global climate and energy initiative. kumi naidoo, the two of you held a news conference, along with a few others, which got some attention. you are calling on u.s. climate negotiators to step down. why? >> when president obama made his election victory speech, he broke his silence on climate change, what it would do to america's children. he then subsequently said that he wants to be a global leader on climate change, but the position that has been taken by the united states in these talks is business as usual, has not reflected the urgency of what has just happened in the united states through hurricane sandy, the fact that there is massive drought in many parts of the country itself, and huge climate impacts happening in a world elsewhere. the bottom line is, the politics of the negotiation is out of touch with all the science says, and president obama and other political leaders need to recognize, nature does not negotiate. we have to change. sadly, these negotiators are not reflecting that urgency and the
paintings of domestic american scenes called forth his deeper creative energies, but magazine illusations of the same everyday activities provided his livelihood. the carefree quality of these scenes appealed to a country recovering from the civil war. americans turned to lighter concerns-- exalting the innocence of childhood, the therapy of the outdoors, the benefits of leisure. throughout his life, homer made seasonal excursions, especially to the shore in summer, to seek subjects for his illustrations and to pursue his painting. at the age of 37, he was at the exact midpoint of his life. acutely aware that his youth was behind him, he was bored by the life of an illustrator, which he called a treadmill existence. in 1873, homer spent his summer in gloucter, massachusetts. there began his first serious use of watercolors. among homer's contributions to american art, perhaps the greatest was his transformation of this medium from its limited use for colored drawings to an art form expressive in its own right. homer's gloucester scenes of children and outdoor life were a continuation of
, but as 2012 dawns, our group green climate fund remains empty. the international energy agency tells us we have five years until the widow to avoid irreversible climate change closes. the science tells us we have five years maximum. you are seeing -- saying, give us 10. the most stark a trailer your generation's responsibility to ours is that you call this ambition. where is the courage in these rooms? now is not the time for incremental actions. in the long run, these will be seen as the defining moments of an era in which narrow self interests prevailed over science, reason, and compassion. there is real ambition in this room, but it is being dismissed as a radical, deemed not politically possible. stand with africa. long-term thinking is not radical. what is radical is to completely alter the planet's climate to betray the future of my generation and to condemn millions to death by climate change. what is radical is to write off the fact that change is within our reach. 2011 was the year in which the sun and jordy found their voice, the year when the bottom shook the top. 2011 was the y
something of the energy of great mountains." (narrator) with success came increased self-assurance. in the summer of 1929, he married irina radetzky. moore stopped teaching and began to concentrate on his own work, and he sought out the leaders of surrealism. he met pablo picasso in paris. the ideas underpinning works like picasso's figure carrying a stone began to filter into moore's sensibility, emerging as the four-piece composition. alberto giacometti was also an influence. the swiss sculptor was exploring an abstract style - part biology, part geometry - in works like woman. moore responded with a carved, abstracted head. he continued to explore surrealism and its exploration of what lay beyond the boundaries of logic and reason. moore joined the loose association of british artists who were influenced by surrealism. he showed works in the international surrealist exhibition of 1936 in london. but he was not quite a card-carrying surrealist. henry moore took from the continental avant-garde of his day whatever he liked the look of, and he played with it visually and
Search Results 0 to 6 of about 7